thin provisioning in RHEV or on SAN ?

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I'm considering finally starting to use thin provisioning somewhere, but am uncertain about where. Ideally I'd want to do it on the SAN only, so that we have one place to monitor for never running out-of-storage.

So, if I do thin provisioning on my SAN, how will this work with RHEV images? At which point does it get allocated?

  1. On storage domain creation?
  2. When we add a disk to a VM ?
  3. When VM creates a logical volume in it's VG?
  4. When VM creates a filesystem on top of the logical volume?

 

(btw: storage domain is accessed over iSCSI, VMs are mainly RHEL5/RHEL6 -- in case that matters)

 

  -jf

ja

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